package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器,支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1. 获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求:{}", requestURI);

        //定义不需要处理的请求路劲
        String[] urls = new String[]{
                "/employee/login",/*登录操作访问路径*/
                "/employee/logout", /*退出操作访问路径*/
                "/backend/**",
                "/front/**",
                "/user/login",
                "/user/sendMsg",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
                //复制的
//                "/doc.html",
//                "/webjars/**",
//                "/swagger-resources",
//                "/v2/api-docs"
        };

        //2. 判断本次请求, 是否需要登录, 才可以访问
        boolean check = check(urls, requestURI);

        //3. 如果不需要，则直接放行
        if (check) {
            log.info("本次请求{}不需要处理", requestURI);
            filterChain.doFilter(request, response);
            return;
        }
        //4-1. 判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录,用户id为:{}", request.getSession().getAttribute("employee"));

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request, response);
            return;
        }

        //4-2. 判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录,用户id为:{}", request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request, response);
            return;
        }

        log.info("用户未登录");
        //5. 如果未登录, 则返回未登录结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

//        log.info("拦截到请求: {}",request.getRequestURI());
//        filterChain.doFilter(request,response);
    }

    public boolean check(String[] urls, String requestURI) {
        //遍历数组,匹配上就return结束循环,返回true,没有返回false
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
